I use my iPhone/iPad screens as digital message board. A bit like digital message boards you might see in airports, doctors waiting rooms or train stations.
My current strategy is to open a photo editing app on my iPhone, write a message, save a jpeg in the photos app, sync the photo across my iPhone/iPad and then assign the photo as wallpaper for the lock screen.
But I'm wondering if there is an app which I can display messages as wallpaper in the lock screen and sync across iOS devices?